<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        .content{
            width: 100%;
            height: 100%;
            display: flex;
            align-items: center;
            justify-content: center;
            flex-direction: column;
        }

        .button1{
            width: 100px;
            height: 100px;
            background: red;
            border-radius: 50%;
            margin-bottom: 20px;
            transition: transform 1s ease-in-out;
        }

        .button1:hover{
            transform: scale(1.2);
        }

        .button2{
            width: 100px;
            height: 100px;
            background: red;
            border-radius: 50%;
            margin-bottom: 20px;
            transition: transform 1s ease-in-out;
        }

        .button2:active{
            transform: scale(1.2);
        }

       .input{
            width: 200px;
            height: 50px;
            border: 1px solid #ccc;
            border-radius: 5px;
            margin-bottom: 20px;
            transition: border-color 1s ease-in-out;
        }

       .input:focus{
            border-color: #000;
        }

        .button3 {
            width: 100px;
            height: 100px;
            background: red;
            border-radius: 50%;
            margin-bottom: 20px;
        }

        .content:nth-child(3) {
            background-color: aqua;
        }


        .content:last-child {
            background-color: rgb(255, 166, 0);
        }
    </style>    
</head>
<body>
    <div class="content">
        <div class="button1"></div>
        <div class="button2"></div>
        <input class="input" type="text" placeholder="请输入" />
        <div class="button3"></div>
        <div class="button4"></div>
    </div>
</body>
</html>